Need Book UI - [1.16.5][Skript][skript-reflect] Book UI | SpigotMC - High Performance Minecraft

installation:
1> download
2> extract to "plugins/"
3> move "ymlbookstorage.sk" to "plugins/skript/scripts/"

#
Stack trace:
[15:12:03 ERROR]: #!#! while scanning for the next token
found character '\t(TAB)' that cannot start any token. (Do not use \t(TAB) for indentation)
in 'string', line 35, column 1:
SubBook:

on Yaml~dont use tab in it
use 4 space